Calibration of the pressure dependence of theR1ruby fluorescence line to 195 kbar

摘要

The pressure dependence of theR1ruby fluorescence line has been calibrated at 25thinsp;deg;C against the compression of NaCl. Pressures are determined using the Decker equation of state for NaCl. The dependence is linear to 195 kbar following the equationPNaCl=2.746(Dgr;lgr;), wherePis in kbar and Dgr;lgr; in Aring;. The uncertainty in the value of the slope,dp/dlgr;, expressed in terms of a 95percnt; confidence interval is 2.746plusmn;0.014 kbarthinsp;Aring;minus;1. The coefficient of the quadratic term (Dgr;lgr;)2is not significantly different from zero; and the quadratic term makes indeed a negligible contribution to the fit. Taking into account the reported uncertainty associated with the Decker equation of state for NaCl, the value of the slope is 2.740plusmn;0.016 kbarthinsp;Aring;minus;1within a 95percnt; confidence interval.